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Date: Mon, 21 Mar 2022 15:50:00 +0800
From: CK Hu <ck.hu@...iatek.com>
To: Rex-BC Chen <rex-bc.chen@...iatek.com>, <chunkuang.hu@...nel.org>
CC: <airlied@...ux.ie>, <jason-jh.lin@...iatek.com>,
<linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
<Project_Global_Chrome_Upstream_Group@...iatek.com>,
<nancy.lin@...iatek.com>, <linux-mediatek@...ts.infradead.org>,
<yongqiang.niu@...iatek.com>, <hsinyi@...gle.com>,
<matthias.bgg@...il.com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH V2] drm/mediatek: Add vblank register/unregister
callback functions
Hi, Rex:
On Mon, 2022-03-21 at 15:23 +0800, Rex-BC Chen wrote:
> We encountered a kernel panic issue that callback data will be NULL
> when
> it's using in ovl irq handler. There is a timing issue between
> mtk_disp_ovl_irq_handler() and mtk_ovl_disable_vblank().
>
> To resolve this issue, we use the flow to register/unregister vblank
> cb:
> - Register callback function and callback data when crtc creates.
> - Unregister callback function and callback data when crtc destroies.
>
> With this solution, we can assure callback data will not be NULL when
> vblank is disable.
Reviewed-by: CK Hu <ck.hu@...iatek.com>
>
> Fixes: 9b0704988b15 ("drm/mediatek: Register vblank callback
> function")
> Signed-off-by: Rex-BC Chen <rex-bc.chen@...iatek.com>
> Reviewed-by: jason-jh.lin <jason-jh.lin@...iatek.com>
>
> ----
> V2:
> 1. Change title to "Add vblank register/unregister callback
> functions".
> ----
>
> ---
> drivers/gpu/drm/mediatek/mtk_disp_drv.h | 16 +++++++-----
> drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 22 ++++++++++++----
> drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 20 +++++++++-----
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 14 +++++++++-
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 4 +++
> drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 29 ++++++++++++++++---
> --
> 6 files changed, 80 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> index 86c3068894b1..974462831133 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
> @@ -76,9 +76,11 @@ void mtk_ovl_layer_off(struct device *dev,
> unsigned int idx,
> void mtk_ovl_start(struct device *dev);
> void mtk_ovl_stop(struct device *dev);
> unsigned int mtk_ovl_supported_rotations(struct device *dev);
> -void mtk_ovl_enable_vblank(struct device *dev,
> - void (*vblank_cb)(void *),
> - void *vblank_cb_data);
> +void mtk_ovl_register_vblank_cb(struct device *dev,
> + void (*vblank_cb)(void *),
> + void *vblank_cb_data);
> +void mtk_ovl_unregister_vblank_cb(struct device *dev);
> +void mtk_ovl_enable_vblank(struct device *dev);
> void mtk_ovl_disable_vblank(struct device *dev);
>
> void mtk_rdma_bypass_shadow(struct device *dev);
> @@ -93,9 +95,11 @@ void mtk_rdma_layer_config(struct device *dev,
> unsigned int idx,
> struct cmdq_pkt *cmdq_pkt);
> void mtk_rdma_start(struct device *dev);
> void mtk_rdma_stop(struct device *dev);
> -void mtk_rdma_enable_vblank(struct device *dev,
> - void (*vblank_cb)(void *),
> - void *vblank_cb_data);
> +void mtk_rdma_register_vblank_cb(struct device *dev,
> + void (*vblank_cb)(void *),
> + void *vblank_cb_data);
> +void mtk_rdma_unregister_vblank_cb(struct device *dev);
> +void mtk_rdma_enable_vblank(struct device *dev);
> void mtk_rdma_disable_vblank(struct device *dev);
>
> #endif
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> index 2146299e5f52..1fa1bbac9f9c 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c
> @@ -96,14 +96,28 @@ static irqreturn_t mtk_disp_ovl_irq_handler(int
> irq, void *dev_id)
> return IRQ_HANDLED;
> }
>
> -void mtk_ovl_enable_vblank(struct device *dev,
> - void (*vblank_cb)(void *),
> - void *vblank_cb_data)
> +void mtk_ovl_register_vblank_cb(struct device *dev,
> + void (*vblank_cb)(void *),
> + void *vblank_cb_data)
> {
> struct mtk_disp_ovl *ovl = dev_get_drvdata(dev);
>
> ovl->vblank_cb = vblank_cb;
> ovl->vblank_cb_data = vblank_cb_data;
> +}
> +
> +void mtk_ovl_unregister_vblank_cb(struct device *dev)
> +{
> + struct mtk_disp_ovl *ovl = dev_get_drvdata(dev);
> +
> + ovl->vblank_cb = NULL;
> + ovl->vblank_cb_data = NULL;
> +}
> +
> +void mtk_ovl_enable_vblank(struct device *dev)
> +{
> + struct mtk_disp_ovl *ovl = dev_get_drvdata(dev);
> +
> writel(0x0, ovl->regs + DISP_REG_OVL_INTSTA);
> writel_relaxed(OVL_FME_CPL_INT, ovl->regs +
> DISP_REG_OVL_INTEN);
> }
> @@ -112,8 +126,6 @@ void mtk_ovl_disable_vblank(struct device *dev)
> {
> struct mtk_disp_ovl *ovl = dev_get_drvdata(dev);
>
> - ovl->vblank_cb = NULL;
> - ovl->vblank_cb_data = NULL;
> writel_relaxed(0x0, ovl->regs + DISP_REG_OVL_INTEN);
> }
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> index d41a3970b944..943780fc7bf6 100644
> --- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> +++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
> @@ -94,24 +94,32 @@ static void rdma_update_bits(struct device *dev,
> unsigned int reg,
> writel(tmp, rdma->regs + reg);
> }
>
> -void mtk_rdma_enable_vblank(struct device *dev,
> - void (*vblank_cb)(void *),
> - void *vblank_cb_data)
> +void mtk_rdma_register_vblank_cb(struct device *dev,
> + void (*vblank_cb)(void *),
> + void *vblank_cb_data)
> {
> struct mtk_disp_rdma *rdma = dev_get_drvdata(dev);
>
> rdma->vblank_cb = vblank_cb;
> rdma->vblank_cb_data = vblank_cb_data;
> - rdma_update_bits(dev, DISP_REG_RDMA_INT_ENABLE,
> RDMA_FRAME_END_INT,
> - RDMA_FRAME_END_INT);
> }
>
> -void mtk_rdma_disable_vblank(struct device *dev)
> +void mtk_rdma_unregister_vblank_cb(struct device *dev)
> {
> struct mtk_disp_rdma *rdma = dev_get_drvdata(dev);
>
> rdma->vblank_cb = NULL;
> rdma->vblank_cb_data = NULL;
> +}
> +
> +void mtk_rdma_enable_vblank(struct device *dev)
> +{
> + rdma_update_bits(dev, DISP_REG_RDMA_INT_ENABLE,
> RDMA_FRAME_END_INT,
> + RDMA_FRAME_END_INT);
> +}
> +
> +void mtk_rdma_disable_vblank(struct device *dev)
> +{
> rdma_update_bits(dev, DISP_REG_RDMA_INT_ENABLE,
> RDMA_FRAME_END_INT, 0);
> }
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index d661edf7e0fe..e42a9bfa0ecb 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -152,6 +152,7 @@ static void mtk_drm_cmdq_pkt_destroy(struct
> cmdq_pkt *pkt)
> static void mtk_drm_crtc_destroy(struct drm_crtc *crtc)
> {
> struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
> + int i;
>
> mtk_mutex_put(mtk_crtc->mutex);
> #if IS_REACHABLE(CONFIG_MTK_CMDQ)
> @@ -162,6 +163,14 @@ static void mtk_drm_crtc_destroy(struct drm_crtc
> *crtc)
> mtk_crtc->cmdq_client.chan = NULL;
> }
> #endif
> +
> + for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) {
> + struct mtk_ddp_comp *comp;
> +
> + comp = mtk_crtc->ddp_comp[i];
> + mtk_ddp_comp_unregister_vblank_cb(comp);
> + }
> +
> drm_crtc_cleanup(crtc);
> }
>
> @@ -616,7 +625,7 @@ static int mtk_drm_crtc_enable_vblank(struct
> drm_crtc *crtc)
> struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
> struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[0];
>
> - mtk_ddp_comp_enable_vblank(comp, mtk_crtc_ddp_irq, &mtk_crtc-
> >base);
> + mtk_ddp_comp_enable_vblank(comp);
>
> return 0;
> }
> @@ -916,6 +925,9 @@ int mtk_drm_crtc_create(struct drm_device
> *drm_dev,
> if (comp->funcs->ctm_set)
> has_ctm = true;
> }
> +
> + mtk_ddp_comp_register_vblank_cb(comp, mtk_crtc_ddp_irq,
> + &mtk_crtc->base);
> }
>
> for (i = 0; i < mtk_crtc->ddp_comp_nr; i++)
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index b4b682bc1991..028cf76b9531 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -297,6 +297,8 @@ static const struct mtk_ddp_comp_funcs ddp_ovl =
> {
> .config = mtk_ovl_config,
> .start = mtk_ovl_start,
> .stop = mtk_ovl_stop,
> + .register_vblank_cb = mtk_ovl_register_vblank_cb,
> + .unregister_vblank_cb = mtk_ovl_unregister_vblank_cb,
> .enable_vblank = mtk_ovl_enable_vblank,
> .disable_vblank = mtk_ovl_disable_vblank,
> .supported_rotations = mtk_ovl_supported_rotations,
> @@ -321,6 +323,8 @@ static const struct mtk_ddp_comp_funcs ddp_rdma =
> {
> .config = mtk_rdma_config,
> .start = mtk_rdma_start,
> .stop = mtk_rdma_stop,
> + .register_vblank_cb = mtk_rdma_register_vblank_cb,
> + .unregister_vblank_cb = mtk_rdma_unregister_vblank_cb,
> .enable_vblank = mtk_rdma_enable_vblank,
> .disable_vblank = mtk_rdma_disable_vblank,
> .layer_nr = mtk_rdma_layer_nr,
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> index 4c6a98662305..b83f24cb045f 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
> @@ -48,9 +48,11 @@ struct mtk_ddp_comp_funcs {
> unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
> void (*start)(struct device *dev);
> void (*stop)(struct device *dev);
> - void (*enable_vblank)(struct device *dev,
> - void (*vblank_cb)(void *),
> - void *vblank_cb_data);
> + void (*register_vblank_cb)(struct device *dev,
> + void (*vblank_cb)(void *),
> + void *vblank_cb_data);
> + void (*unregister_vblank_cb)(struct device *dev);
> + void (*enable_vblank)(struct device *dev);
> void (*disable_vblank)(struct device *dev);
> unsigned int (*supported_rotations)(struct device *dev);
> unsigned int (*layer_nr)(struct device *dev);
> @@ -111,12 +113,25 @@ static inline void mtk_ddp_comp_stop(struct
> mtk_ddp_comp *comp)
> comp->funcs->stop(comp->dev);
> }
>
> -static inline void mtk_ddp_comp_enable_vblank(struct mtk_ddp_comp
> *comp,
> - void (*vblank_cb)(void
> *),
> - void *vblank_cb_data)
> +static inline void mtk_ddp_comp_register_vblank_cb(struct
> mtk_ddp_comp *comp,
> + void
> (*vblank_cb)(void *),
> + void
> *vblank_cb_data)
> +{
> + if (comp->funcs && comp->funcs->register_vblank_cb)
> + comp->funcs->register_vblank_cb(comp->dev, vblank_cb,
> + vblank_cb_data);
> +}
> +
> +static inline void mtk_ddp_comp_unregister_vblank_cb(struct
> mtk_ddp_comp *comp)
> +{
> + if (comp->funcs && comp->funcs->unregister_vblank_cb)
> + comp->funcs->unregister_vblank_cb(comp->dev);
> +}
> +
> +static inline void mtk_ddp_comp_enable_vblank(struct mtk_ddp_comp
> *comp)
> {
> if (comp->funcs && comp->funcs->enable_vblank)
> - comp->funcs->enable_vblank(comp->dev, vblank_cb,
> vblank_cb_data);
> + comp->funcs->enable_vblank(comp->dev);
> }
>
> static inline void mtk_ddp_comp_disable_vblank(struct mtk_ddp_comp
> *comp)
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